to layout a page I use this "tables":

I can define all sizes.

as you can see: every cell of the table can have it's own colour.

I made the whole thing just 80 % broad end every row 50 PIXELS high.

that means, I can size it
a) RELATIVE ... in %
and
b) ABSOLUT ... in pixels.

That means: if you change the size of the window showing the document, the image of relative sized parts CHANGES and absolut sized parts REMAINS.

and here is the next LINK!